World Journal of Gastrointestinal Surgery

Article	Citations
Carbohydrate antigen 19-9 — tumor marker: Past, present, and future	88
Acute pancreatitis and COVID-19: A literature review	33
Lessons learned from an audit of 1250 anal fistula patients operated at a single center: A retrospective review	27
When the bowel meets the bladder: Optimal management of colorectal pathology with urological involvement	20
Gastroenteropancreatic neuroendocrine neoplasms: A clinical snapshot	19
Acute appendicitis–advances and controversies	18
Immunotherapy after liver transplantation: Where are we now?	18
Expanding indications for liver transplantation in the era of liver transplant oncology	17
Current trends in three-dimensional visualization and real-time navigation as well as robot-assisted technologies in hepatobiliary surgery	17
Acute esophageal necrosis: A systematic review and pooled analysis	17
Role of artificial intelligence in hepatobiliary and pancreatic surgery	16
Mucinous adenocarcinoma: A unique clinicopathological subtype in colorectal cancer	15
Diagnosis, severity stratification and management of adult acute pancreatitis–current evidence and controversies	15
Feasibility of robotic assisted bladder sparing pelvic exenteration for locally advanced rectal cancer: A single institution case series	15
Neutrophil-to-lymphocyte ratio predicts acute kidney injury occurrence after gastrointestinal and hepatobiliary surgery	13
Endoscopic therapy of weight regain after bariatric surgery	13
Crucial anatomy and technical cues for laparoscopic transabdominal preperitoneal repair: Advanced manipulation for groin hernias in adults	13
Paradigm shift in gastrointestinal surgery − combating sarcopenia with prehabilitation: Multimodal review of clinical and scientific data	13
Global trends in research related to sleeve gastrectomy: A bibliometric and visualized study	12
Comparison of effects of six main gastrectomy procedures on patients’ quality of life assessed by Postgastrectomy Syndrome Assessment Scale-45	12
Impact of COVID-19 on presentation, management, and outcomes of acute care surgery for gallbladder disease and acute appendicitis	12
Abdominal compartment syndrome among surgical patients	12
Clinical course of suspected small gastrointestinal stromal tumors in the stomach	12
Closure techniques in exposed endoscopic full-thickness resection: Overview and future perspectives in the endoscopic suturing era	12
Acute mesenteric ischemia and small bowel imaging findings in COVID-19: A comprehensive review of the literature	12

Endoscopic ultrasound guided gastrojejunostomy for gastric outlet obstruction	12
Ectopic liver tissue (choristoma) on the gallbladder: A comprehensive literature review	12
Mammalian target of rapamycin inhibitors after post-transplant hepatocellular carcinoma recurrence: Is it too late?	11
Management of complicated acute appendicitis in children: Still an existing controversy	11
Diagnosis of anorectal tuberculosis by polymerase chain reaction, GeneXpert and histopathology in 1336 samples in 776 anal fistula patients	11
Current and emerging therapeutic approaches for colorectal cancer: A comprehensive review	11
Identification of key genes controlling cancer stem cell characteristics in gastric cancer	11
Neoadjuvant treatment: A window of opportunity for nutritional prehabilitation in patients with pancreatic ductal adenocarcinoma	10
Development and future perspectives of natural orifice specimen extraction surgery for gastric cancer	10
Perioperative steroid administration reduces overall complications in patients undergoing liver resection: A meta-analysis	10
COVID-19 outbreak and surgical practice: The rationale for suspending non-urgent surgeries and role of testing modalities	9
Evolution and current status of the subclassification of intermediate hepatocellular carcinoma	9
How can probiotic improve irritable bowel syndrome symptoms?	9
Robotic vs laparoscopic right colectomy – the burden of age and comorbidity in perioperative outcomes: An observational study	9
Narrow pelvic inlet plane area and obesity as risk factors for anastomotic leakage after intersphincteric resection	8
Review of minimally invasive pancreas surgery and opinion on its incorporation into low volume and resource poor centres	8
Robotic donor hepatectomy: Are we there yet?	8
Status of bariatric endoscopy–what does the surgeon need to know? A review	8
Neoadjuvant treatment strategies for hepatocellular carcinoma	8
Liver transplant for large hepatocellular carcinoma in Malatya: The role of gamma glutamyl transferase and alpha-fetoprotein, a retrospective cohort study	8
Newly developed self-expandable Niti-S MD colonic metal stent for malignant colonic obstruction	8
Surgical complications in COVID-19 patients in the setting of moderate to severe disease	8
Is surgery the best treatment for elderly gastric cancer patients?	8
Liver resection for hepatocellular carcinoma larger than 10 cm: A multi-institution long-term observational study	8
Onodera's Prognostic Nutritional Index is a novel and useful prognostic marker for gastrointestinal stromal tumors	8
Laparoscopic Kasai portoenterostomy can be a standard surgical procedure for treatment of biliary atresia	8
Colorectal cancer of the young displays distinct features of aggressive tumor biology: A single-center cohort study	8
Rectovaginal fistula after low anterior resection: Prevention and management	8
Gastrostomy tubes: Fundamentals, periprocedural considerations, and best practices	7
2D vs 3D laparoscopic right colectomy: A propensity score-matching comparison of personal experience with systematic review and meta-analysis	7
Borderline resectable for colorectal liver metastases: Present status and future perspective	7
Short and long-term outcomes between laparoscopic and open total gastrectomy for advanced gastric cancer after neoadjuvant chemotherapy	7
Subtotal colectomy in ulcerative colitis—long term considerations for the rectal stump	7
Association between acute pancreatitis and COVID-19 infection: What do we know?	7
Biliary drainage in inoperable malignant biliary distal obstruction: A systematic review and meta-analysis	7
Transanal minimally invasive surgery using laparoscopic instruments of the rectum: A review	7
Predictive significance of cancer related-inflammatory markers in locally advanced rectal cancer	7
Recent advances in diagnosis and treatment of gastroenteropancreatic neuroendocrine neoplasms	7
Drug-eluting beads transarterial chemoembolization sequentially combined with radiofrequency ablation in the treatment of untreated and recurrent hepatocellular carcinoma	7
Chylous ascites in colorectal surgery: A systematic review	7
Global research production pertaining to gastrointestinal involvement in COVID-19: A bibliometric and visualised study	7
Role of micronutrients in staging of nonalcoholic fatty liver disease: A retrospective cross-sectional study	6
Current and future role of three-dimensional modelling technology in rectal cancer surgery: A systematic review	6
Genitourinary function and defecation after colorectal cancer surgery with low- and high-ligation of the inferior mesenteric artery: A meta-analysis	6
Assessment of tumor markers CA 19-9, CEA, CA 125, and CA 242 for the early diagnosis and prognosis prediction of gallbladder cancer	6
Pancreas-preserving duodenal resections vs pancreatoduodenectomy for groove pancreatitis. Should we revisit treatment algorithm for groove pancreatitis?	6
Finding the seed of recurrence: Hepatocellular carcinoma circulating tumor cells and their potential to drive the surgical treatment	6
Utility of preoperative systemic inflammatory biomarkers in predicting postoperative complications after pancreaticoduodenectomy: Literature review and single center experience	6
Efficacy and safety of early oral feeding in postoperative patients with upper gastrointestinal tumor: A systematic review and meta-analysis	6
Application value of mixed reality in hepatectomy for hepatocellular carcinoma	6

Prognostic significance of regional lymphadenectomy in T1b gallbladder cancer: Results from 24 hospitals in China	6
Giant hepatic extra-gastrointestinal stromal tumor treated with cytoreductive surgery and adjuvant systemic therapy: A case report and review of literature	6
Application of indocyanine green in surgery: A review of current evidence and implementation in trauma patients	6
Combination of preoperative fibrinogen and D-dimer as a prognostic indicator in pancreatic ductal adenocarcinoma patients undergoing R0 resection	6
Current status of liver transplantation for cholangiocarcinoma	6
The global epidemiology of upper and lower gastrointestinal bleeding in general population: A systematic review	6
Risk factors for postoperative stoma outlet obstruction in ulcerative colitis	6
Xanthogranulomatous appendicitis: A comprehensive literature review	6
Over-the-scope-grasper: A new tool for pancreatic necrosectomy and beyond - first multicenter experience	6
Literature review of the outcome of and methods used to improve transperineal repair of rectocele	5
Transarterial chemoembolization failure/refractoriness: A scientific concept or pseudo-proposition	5
Efficacy of staple line reinforcement by barbed suture for preventing anastomotic leakage in laparoscopic rectal cancer surgery	5
Contemporary indications for and outcomes of hepatic resection for neuroendocrine liver metastases	5
Laparoscopy for Crohn's disease: A comprehensive exploration of minimally invasive surgical techniques	5
Preoperative serum carbohydrate antigen 19-9 levels predict early recurrence after the resection of early-stage pancreatic ductal adenocarcinoma	5
Feasible management of median arcuate ligament syndrome in orthotopic liver transplantation recipients	5
Paraesophageal hernia and iron deficiency anemia: Mechanisms, diagnostics and therapy	5
Laparoscopic hepatectomy reduces postoperative complications and hospital stay in overweight and obese patients	5
Multidisciplinary management of acute mesenteric ischemia: Surgery and endovascular intervention	5
Fluorescence cholangiography enhances surgical residents’ biliary delineation skill for laparoscopic cholecystectomies	5
Para-aortic lymph node involvement should not be a contraindication to resection of pancreatic ductal adenocarcinoma	5
Practices concerning sleeve gastrectomy in Turkey: A survey of surgeons	5
Gastric per-oral endoscopic myotomy: Indications, technique, results and comparison with surgical approach	5
Exosomal noncoding RNAs in cholangiocarcinoma: Laboratory noise or hope?	5
Treatment for hepatocellular carcinoma with tumor thrombosis in the hepatic vein or inferior vena cava: A comprehensive review	5
Colonic Crohn’s disease – decision is more important than incision: A surgical dilemma	5
Borderline resectable pancreatic cancer: Certainties and controversies	5
Comparison between recent sphincter-sparing procedures for complex anal fistulas-ligation of intersphincteric tract vs transanal opening of intersphincteric space	5
Influence of postoperative complications on long-term survival in liver transplant patients	5
Role of minimally invasive techniques in gastrointestinal surgery: Current status and future perspectives	4
Trends of rapamycin in survival benefits of liver transplantation for hepatocellular carcinoma	4
Liver resection vs radiofrequency ablation in single hepatocellular carcinoma of posterosuperior segments in elderly patients	4
Evaluation of prognostic factors and clinicopathological patterns of recurrence after curative surgery for colorectal cancer	4
New common bile duct morphological subtypes: Risk predictors of common bile duct stone recurrence	4
Management of synchronous lateral pelvic nodal metastasis in rectal cancer in the era of neoadjuvant chemoradiation: A systemic review	4
Laparoscopic vs open total gastrectomy for advanced gastric cancer following neoadjuvant therapy: A propensity score matching analysis	4
Efficacy of the fat-dissociation method for nodal harvesting in gastric cancer	4
Associating liver partition and portal vein ligation for staged hepatectomy in the treatment of colorectal cancer liver metastases	4
Postoperative complications after robotic resection of colorectal cancer: An analysis based on 5-year experience at a large-scale center	4
Current status of treatments of pancreatic and peripancreatic collections of acute pancreatitis	4
Gastrectomy impact on the gut microbiome in patients with gastric cancer: A comprehensive review	4
Colorectal cancer metastases to the thyroid gland: A case report	4
Therapeutic interventional endoscopic ultrasound in pancreato-biliary disorders: Does it really replace the surgical/percutaneous approach?	4
Photodynamic therapy: A next alternative treatment strategy for hepatocellular carcinoma?	4
Drain fluid biomarkers for prediction and diagnosis of clinically relevant postoperative pancreatic fistula: A narrative review	4
Post-COVID-19 cholangiopathy: Current understanding and management options	4
Right sided diverticulitis in western countries: A review	4
Efficacy of hybrid endoscopic submucosal dissection with SOUTEN in gastric lesions: An ex vivo porcine model basic study	4
Platelet rich plasma effectiveness in bowel anastomoses: A systematic review	4
Are laparoscopic cholecystectomy and natural orifice transluminal endoscopic surgery gallbladder preserving cholecystolithotomy truly comparable? A propensity matched study	4
Development of a prediction model for enteral feeding intolerance in intensive care unit patients: A prospective cohort study	4
Factors associated with hypertension remission after gastrectomy for gastric cancer patients	4
Postoperative adjuvant therapy for hepatocellular carcinoma with microvascular invasion	4
Introduction of new techniques and technologies in surgery: Where is transanal total mesorectal excision today?	4
Short term outcomes of minimally invasive selective lateral pelvic lymph node dissection for low rectal cancer	4
Development and validation of a prediction model for deep vein thrombosis in older non-mild acute pancreatitis patients	3
Impact of parenchyma-preserving surgical methods on treating patients with solid pseudopapillary neoplasms: A retrospective study with a large sample size	3
Early detection of colorectal cancer based on circular DNA and common clinical detection indicators	3
Risk factors and prediction model for inpatient surgical site infection after elective abdominal surgery	3
Laparoscopic-assisted vs open transhiatal gastrectomy for Siewert type II adenocarcinoma of the esophagogastric junction: A retrospective cohort study	3
Choice of operative method for pancreaticojejunostomy and a multivariable study of pancreatic leakage in pancreaticoduodenectomy	3
Surgical ampullectomy: A comprehensive review	3
Expression of adipokine ghrelin and ghrelin receptor in human colorectal adenoma and correlation with the grade of dysplasia	3
Comparison between laparoscopic uncut Roux-en-Y and Billroth II with Braun anastomosis after distal gastrectomy: A meta-analysis	3
Surgical strategies for Mirizzi syndrome: A ten-year single center experience	3
Software improvement for evaluation of laryngopharyngeal pH testing (Restech) – a comparison between DataView 3 and 4	3
Impact of palliative therapies in metastatic esophageal cancer patients not receiving chemotherapy	3
Patients with Clostridium difficile infection and prior appendectomy may be prone to worse outcomes	3
Predicting the outcome of closed-loop small bowel obstruction by preoperative characteristics	3
Surgical treatment for recurrent hepatocellular carcinoma: Current status and challenges	3
Is omentectomy necessary in the treatment of benign or malignant abdominal pathologies? A systematic review	3
Low serum albumin may predict poor efficacy in patients with perforated peptic ulcer treated nonoperatively	3
Prognostic significance of the preoperative hemoglobin to albumin ratio for the short-term survival of gastric cancer patients	3
Current surgical management of duodenal gastrointestinal stromal tumors	3
Statistical proof of Helicobacter pylori eradication in preventing metachronous gastric cancer after endoscopic resection in an East Asian population	3
Long-term survival of patients with stage II and III gastric cancer who underwent gastrectomy with inadequate nodal assessment	3
Magnetic compression anastomosis for reconstruction of digestive tract after total gastrectomy in beagle model	3
Gastric splenosis mimicking a gastrointestinal stromal tumor: A case report	3
Reappraisal of surgical decision-making in patients with splenic sclerosing angiomatoid nodular transformation: Case series and literature review	3
Partial pancreatic tail preserving subtotal pancreatectomy for pancreatic cancer: Improving glycemic control and quality of life without compromising oncological outcomes	3

Advances in endoscopic therapy using grasping-type scissors forceps (with video)	3
Indications for the surgical management of pancreatic trauma: An update	3
Benign vs malignant pancreatic lesions: Molecular insights to an ongoing debate	3
Retrorectal tumors: A challenge for the surgeons	3
3D laparoscopic-assisted vs open gastrectomy for carcinoma in the remnant stomach: A retrospective cohort study	3
Pre-colonoscopy special guidance and education on intestinal cleaning and examination in older adult patients with constipation	3
Correlation between preoperative systemic immune inflammation index, nutritional risk index, and prognosis of radical resection of liver cancer	3
Preoperative risk modelling for oesophagectomy: A systematic review	3
Predictors for success of non-operative management of adhesive small bowel obstruction	3
Outcomes of reduction hepatectomy combined with postoperative multidisciplinary therapy for advanced hepatocellular carcinoma	2
Management of early rectal cancer; current surgical options and future direction	2
Castleman disease of the pancreas mimicking pancreatic malignancy on 68Ga-DOTATATE and 18F-fluorodeoxyglucose positron emission tomography/computed tomography: A case report	2
Colonic pouch confers better bowel function and similar postoperative outcomes compared to straight anastomosis for low rectal cancer	2
Risk factors for perioperative complications in laparoscopic surgeries of retrorectal cystic lesions	2
Surveillance strategies following curative resection and non-operative approach of rectal cancer: How and how long? Review of current recommendations	2
Endoscopic radial incision and cutting technique for treatment-naive stricture of colorectal anastomosis: Two case reports	2
Comparison of perioperative outcomes between laparoscopic and open partial splenectomy in children and adolescents	2
Assistant skill in gastric endoscopic submucosal dissection using a clutch cutter	2
Gastric endoscopic submucosal dissection in Western countries: Indications, applications, efficacy and training perspective	2
Surgical management of acute pancreatitis: Historical perspectives, challenges, and current management approaches	2
Efficacy and outcome of extensive intraoperative peritoneal lavage plus surgery vs surgery alone with advanced gastric cancer patients	2
New perspectives on robotic pancreaticoduodenectomy: An analysis of the National Cancer Database	2
COVID-19 outbreak and endoscopy: Considerations in patients encountered in a foregut surgery practice	2
The spectrum of pneumatosis intestinalis in the adult. A surgical dilemma	2
Preoperative calculation of angles of vision and working area in laparoscopic surgery to treat a giant hiatal hernia	2
Research progress regarding programmed cell death 1/programmed cell death ligand 1 inhibitors combined with targeted therapy for treating hepatocellular carcinoma	2
Subacute liver and respiratory failure after segmental hepatectomy for complicated hepatolithiasis with secondary biliary cirrhosis: A case report	2
Novel roles of lipopolysaccharide and TLR4/NF-κB signaling pathway in inflammatory response to liver injury in Budd-Chiari syndrome	2
Surgical aspects of small intestinal neuroendocrine tumors	2
Effects of postoperative use of proton pump inhibitors on gastrointestinal bleeding after endoscopic variceal treatment during hospitalization	2
Whole circumferential endoscopic submucosal dissection of superficial adenocarcinoma in long-segment Barrett's esophagus: A case report	2
External use of mirabilite to prevent post-endoscopic retrograde cholangiopancreatography pancreatitis in children: A multicenter randomized controlled trial	2
Remnant gastric cancer: An ordinary primary adenocarcinoma or a tumor with its own pattern?	2
Quality of life after colorectal surgery: A prospective study of patients compared with their spouses	2
Long-term efficacy and safety of cap-assisted endoscopic sclerotherapy with long injection needle for internal hemorrhoids	2
Evaluating the benefit of adjuvant chemotherapy in patients with ypT0–1 rectal cancer treated with preoperative chemoradiotherapy	2
Laparoscopic vs open surgery in ileostomy reversal in Crohn’s disease: A retrospective study	2
Gallbladder perforation with fistulous communication	2
Individualized risk estimation for postoperative pulmonary complications after hepatectomy based on perioperative variables	2
Choledocholithiasis characteristics with periampullary diverticulum and endoscopic retrograde cholangiopancreatography procedures: Comparison between two centers from Lanzhou and Kyoto	2
Distal gastric tube resection with vascular preservation for gastric tube cancer: A case report and review of literature	2
Optimal postoperative surveillance strategies for stage III colorectal cancer	2
Research progress on O-GlcNAcylation in the occurrence, development, and treatment of colorectal cancer	2
Novel parameter based on lipid indicators ratio improves prognostic value of plasma lipid levels in resectable colorectal cancer patients	2
Comparison of safety, efficacy, and long-term follow-up between “one-step” and “step-up” approaches for infected pancreatic necrosis	2
Nomograms predicting prognosis of patients with pathological stages T1N2-3 and T3N0 gastric cancer	2
Could neoadjuvant chemotherapy increase postoperative complication risk of laparoscopic total gastrectomy? A mono-institutional propensity score-matched study in China	2
Transjugular intrahepatic portosystemic shunt with radioactive seed strand for main portal vein tumor thrombosis with cirrhotic portal hypertension	2
Elderly patients over 80 years undergoing colorectal cancer resection: Development and validation of a predictive nomogram for survival	2
Predictors of difficult endoscopic resection of submucosal tumors originating from the muscularis propria layer at the esophagogastric junction	2
Impact of comorbid renal dysfunction in patients with hepatocellular carcinoma on long-term outcomes after curative resection	2
Effect of cholesterol on in vitro cultured interstitial Cajal-like cells isolated from guinea pig gallbladders	2
Mesh erosion into the colon following repair of parastomal hernia: A case report	2
Laparoscopic appendectomy, stump closure and endoloops: A meta-analysis	2
Nomogram for predicting chylous ascites after right colectomy	2
Gastrointestinal obstruction secondary to enteral nutrition bezoar: A case report	2
Impact of endoscopic ultrasound-guided radiofrequency ablation in managing pancreatic malignancy	2
Impact of body mass index in elderly patients treated with laparoscopic liver resection for hepatocellular carcinoma	2
Role of mesenteric component in Crohn’s disease: A friend or foe?	2
Does cranial-medial mixed dominant approach have a unique advantage for laparoscopic right hemicolectomy with complete mesocolic excision?	2
Patient-centered developments in colon- and rectal cancer with a multidisciplinary international team: From translational research to national guidelines	2
Long-term survival outcome of laparoscopic liver resection for hepatocellular carcinoma	2
Low preoperative skeletal muscle index increases the risk of mortality among resectable pancreatic cancer patients: A retrospective study	2
Nomogram to predict permanent stoma in rectal cancer patients after sphincter-saving surgery	2
Acinous cell AR42J-derived exosome miR125b-5p promotes acute pancreatitis exacerbation by inhibiting M2 macrophage polarization via PI3K/AKT signaling pathway	2
Surgery for Cronkhite-Canada syndrome complicated with intussusception: A case report and review of literature	2
Prognostic effect of excessive chemotherapy cycles for stage II and III gastric cancer patients after D2 + gastrectomy	2
Effect of cardiac output - guided hemodynamic management on acute lung injury in pediatric living donor liver transplantation	1
Prognostic value of preoperative immune-nutritional scoring systems in remnant gastric cancer patients undergoing surgery	1
Minimally invasive endoscopic repair of rectovaginal fistula	1
Intestinal perforation with abdominal abscess caused by extramedullary plasmacytoma of small intestine: A case report and literature review	1
Analysis of the impact of ERAS-based respiratory function training on older patients’ ability to prevent pulmonary complications after abdominal surgery	1
Feasibility and safety of “bridging” pancreaticogastrostomy for pancreatic trauma in Landrace pigs	1
Dissimilar survival and clinicopathological characteristics of mucinous adenocarcinoma located in pancreatic head and body/tail	1
Risk prediction of common bile duct stone recurrence based on new common bile duct morphological subtypes	1
Immunotherapy in combination with chemotherapy for Peutz-Jeghers syndrome with advanced cervical cancer: A case report	1
Comparison between upfront surgery and neoadjuvant chemotherapy in patients with locally advanced gastric cancer: A systematic review	1
Robotic transanal total mesorectal excision: Is the future now?	1
Imaging of acute appendicitis: Advances	1
CD4+CD25+ regulatory T cells decreased future liver remnant after associating liver partition and portal vein ligation for staged hepatectomy	1
Association of anastomotic leakage with long-term oncologic outcomes of patients with esophagogastric junction cancer	1
Clinical application and research progress of extracellular slow wave recording in the gastrointestinal tract	1
Positive correlation between latent Epstein-Barr virus infection and severity of illness in inflammatory bowel disease patients	1
Ewing sarcoma of the jejunum: A case report and literature review	1
Prognostic predictors in patients with sepsis after gastrointestinal tumor surgery: A retrospective study	1
Laparoscopic resection and endoscopic submucosal dissection for treating gastric ectopic pancreas	1
Including video and novel parameter-height of penetration of external anal sphincter-in magnetic resonance imaging reporting of anal fistula	1
Long-term outcomes of postgastrectomy syndrome after total laparoscopic distal gastrectomy using the augmented rectangle technique	1
Performing robot-assisted pylorus and vagus nerve-preserving gastrectomy for early gastric cancer: A case series of initial experience	1
Prognostic factors for patients with mass-forming intrahepatic cholangiocarcinoma: A case series of 68 patients	1
Three-dimensional visualization and virtual reality simulation role in hepatic surgery: Further research warranted	1
Endoscopic mucosal resection with double band ligation versus endoscopic submucosal dissection for small rectal neuroendocrine tumors	1
Meta-analysis of transanal vs laparoscopic total mesorectal excision of low rectal cancer: Importance of appropriate patient selection	1
Carbohydrate antigen 19-9 as a novel prognostic biomarker in distal cholangiocarcinoma	1
Optimal choice of stapler and digestive tract reconstruction method after distal gastrectomy for gastric cancer: A prospective case–control study	1